ok with new pcm it is the same. I am so lost. What makes a pop in the intake? I was throttling up and I felt and heard a pop in the intake. It has done this a few times now so what does that mean? Lots of fuel still burning away..

 

could the injectors test out at 13 ohms and you hear them clicking but still be pooring to much fuel in? O and I had a backfire and the car blew out a big cloud of black smoke.

 

I am tryin to find out why I get so much smoke at wot. White smoke. I tried a pressure test again and this is my results...

16 psi, drops 5 psi in 30 minutes. Next 30 minutes it drops 2 psi. Is this normal leakdown or is the coolant going somewhere? I have no leaks on the outside of the motor.
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If you are getting white smoke out the exhaust it would suggest that's coolant getting into it. I'd suspect a head gasket or cracked head/block.

 

you think this bars head gasket repair stuff would work on a small leak like this?

 

See heres your problem... its only idling. For the PCM to reach close loop you must MOVE the car. Thats right... you have to go like 1-2 mph for it to actually go into closed loop. With Tunercat you can set the min mph to enable closed loop to "0" mph and then youll get the results you are after.

 

ok well I did drive it 10 miles all diffrent speeds. Get this though, pressure testing the radiator and I decided to start the car and let it run from cold to hot. Smokes a white lil cloud when cold and goes away when hot but if you rev the car the pressure steadily builds. I noticed it going to 30 and wanted to keep going but I stopped it. It would climb 10 psi or more on a rev. Is this right?

 

I wouldnt think so.

 

it smokes bad when I rev it up and the pressure rises fast. I guess it is a head gasket. I wonder if the bs head gasket crap works. I really dont feel like pulling heads at this time of the year.

 

That is incorrect. The car does not need to move to go into closed loop. Have you ever datalogged an LT1?

 

Fix the problems that you know you have before you try hypothesizing other problems. Doesn't matter what the injectors are doing if the PCM is not adjusting for AFR.

So the new PCM is also sitting there showing closed loop with 128 BLM and 128 INT while it also shows rich O2 readings?

 

yes but I now have a tuned pcm from pcmforless and the car does run better. I havnt got my buddys scanner over here to hook up to the new pcm so I dont know if its done alot with the trim but I can say it feels better. Now I think I have a small acceleration leak in a cylinder. I get a lil smoke until warm then none unless I rev it. I have coolant disapearing in the radiator and no fluid on the ground anywhere. That would explain the small miss still at low rpm's. I changed the plugs again and ran it for an hour and pulled them. Theres one plug that keeps a totally clean side with no black or tan residue. I would assume thats the cylinder but I am not sure until I do a leakdown test on it.

I would like to thank everyone that helped me with this project. I work on cars all the time but not so indept. This car was owned by a 18 year old guy who had no clue about all the issues with it. I found at least a dozen problems that would affect the way this car runs and all contributed to running rich. The one thing I feel bad about is the kid broke the coolant temp sensor and didnt even have it plugged in so I am worried he might of overheated it. Anyway this car has come along way and is almost in everyday driving condition, thanks for all your tips and insights. It is important to have boards for others who have no knowledge of there vehicle.

 

If ya are making pressure in the radiator it indicates compression getting in the rad.
Check head gaskets or for a crack somewhere.

 

Check out the PCM constants in Tunercat. Next to last is called "Closed Loop Idle Enable Vehicle Speed"... set on .9 MPH.

I have done quite a bit of idle tuning... makes me wonder if you have ever datalogged.

 

I've got hours of idle datalogs. In closed loop. Without moving.

It would be idiotic of GM to make a car that wouldn't go into closed loop if it didn't move. Among other things it would fail emissions in many states.

Don't believe me? How about Injuneer?

http://web.camaross.com/forums/showp...37&postcount=6

Don't believe him? Do a search in this forum. You'll find plenty of other posts describing what it takes to go into closed loop.

Don't believe anything you read online? Read your service manual. In mine, it's in the subsection "Fuel Metering System" under the section "Driveability and Emissions." If you happen to have a 94 vette, it's page 6E3-C2-2

Don't believe the service manual? Check your copy of Corvette Fuel Injection, it's on p. 176 there.

Makes me wonder if you've ever driven an EFI car, let alone worked on one.